What is the difference between the use of systemic pesticides and contact pesticides?

**Document: Systemic pesticides are absorbed by plants through leaves, roots, and stems after use, and are transported to other parts after entering the plant. Such pesticides are mainly used to control stinging and sucking mouthparts pests, such as Kangfuduo, carbendazim, rice blast, etc.

Contact pesticides enter the body through the epidermis of insects, so that the insect body is poisoned and killed, such pesticides are used to control various types of mouthparts of the pests, such as phosphine.

According to the control object and pesticide performance, the appropriate pesticide dosage form and application method are selected. The prevention and control of crop diseases, insects and weeds should be based on their occurrence locations, damage methods, characteristics, pesticide performance and use. Contact pesticides are mainly sprayed, and must be sprayed evenly so that the agent fully contacts the insect body, so that the pest is killed.

The systemic pesticide can be sprayed and used in the roots, and the systemic insecticide, fungicide 4 5 hours after application, there are 80 active ingredients that can enter the tissue through the absorption of the roots, stems, leaves, etc. of the plant to exert its effect, so as to kill the pathogenic pests that eat.

Pay attention to external diseases, the alternate use of pesticides, pay attention to the mixed use of pesticides, prescribe the right medicine, pay attention to the time of application, pay attention to the dosage of pesticides, and so on, these are the principles to be adhered to.

We must choose targeted pesticides, do not abuse pesticides, but also ensure that there is enough moisture in the soil, and must use pesticides within a reasonable time, and we must grasp the outside temperature.

These adhere to the principle is to read the instructions carefully, do not mix too many pesticide varieties, mix the pesticides to use as soon as possible, to spray evenly, to alternate the use of medicine, to choose the right time to use.

What are you researching? Are you obviously trying to distinguish between the literal meanings? I can only say that not necessarily. Because a pesticide generally has a variety of properties.

Stomach poisoning: It can enter the stomach of pests with food, causing them to poison and die. It is mainly used to control chewing mouthparts pests.

Contact killing: It must come into contact with pests and enter the body from the epidermis, causing poisoning and death.

Systemic absorption: After being applied to the soil or crop surface, it can be absorbed on the surface of the roots, stems or leaves of the crop, and transported in the crop body, when the pest sucks the crop juice or tissue containing the agent, it can be poisoned and died. They are mainly used to control pests with piercing and suction mouthparts.

Contact pesticides are in direct contact with pests through the epidermis to kill pests, broad-spectrum insecticide, universal.

Stomach toxin works wonders against chewing mouthparts pests.

Systemic is almost ineffective against stinging and sucking mouthparts pests and is almost ineffective against chewing mouthparts pests.

Systemic chemical pesticides are not only suitable for pest control.

Analysis: Systemic pesticide refers to the application of pesticides, after a part of the plant is exposed to pesticides, the liquid medicine enters the leaves of the plant through the osmotic effect of leakage (swelling and decay and osmotic pressure between the inner and outer cells), and the liquid medicine can reach all parts of the plant with the water circulation in the plant. In insecticides, aphids feed on the branches and leaves of crops, and the liquid is transmitted through the sap of the plant.

So aphicides are basically systemic in nature. Glyphosate in herbicides is also a systemic pesticide, and the weeds die 5-7 days after the application of the herbicide, and the roots of the weeds are also killed through the conduction of water in the plant. So systemic chemical pesticides are not only suitable for pest control.

The agent can inhibit the application of the fungus after infecting the plant, which can inhibit the growth of the fungus, and even cause death, reduce the damage of the plant, and restore health. Most of the pesticide fungicides with typical efficacy are systemic agents, which have strong systemic effects. However, systemic fungicides have a two-way systemic conduction effect, especially for the best effect.

Bacteria are not susceptible to resistance to protective fungicides, whereas they are easily resistant to systemic fungicides. Therefore, it is recommended to use both. <

Systemic insecticides generally refer to those that can be absorbed by crops and conducted in the body to achieve the purpose of controlling pests and diseases. For example, tricyclazole has good systemic ability, and is quickly absorbed by rice after application, so it can be applied in the rain gap), and enters the surface layer of rice leaves through in vivo conduction to prevent the germination and immersion of rice blast spores, and the inhibitory effect of the drug on isolated rice blast pathogens is weak. Due to its good systemic properties, it has a good control effect on brown planthoppers that mainly occur at the base of rice, and its control effect is better than that of other insecticides that only have contact killing characteristics.

It is not necessary for the drug to have a strong systemic ability to work, but also to have a high level of activity. <

Read the product leaflet carefully before mixing pesticides. It is necessary to operate in strict accordance with the methods required in the product manual. Pesticides should not be mixed with too many pesticides.

There can be no more than 3 kinds of systemic fungicides, otherwise the inaccuracy of their interaction will be greatly increased, and the possibility of failure or drug damage will also increase. Need for medication rotation: Medication rotation can delay the development of harmful bacteria.

When applying pesticides, pesticide varieties should be rotated frequently to delay the emergence of resistance. The spraying should be uniform, and most of the systemic agent is mainly transmitted to the upper part of the plant, and rarely to the down. Therefore, it must be uniform in the process of use, and there can be no heavy spraying without leakage.

First of all, we must prescribe the right medicine, choose the right pesticides, pay attention to the proportion and dosage of pesticides, when spraying pesticides, we must wear protective clothing, avoid contact with **, should avoid rainy weather or windy weather, it is best to choose to use pesticides on sunny days, so that it will not affect the effect of pesticides.

The most important thing when using systemic agents is to have appropriate amount of water, the amount of irrigation water should not be too large to avoid the loss of agents, and the amount of water should not be too small when spraying. The key to using contact agents is to spray carefully and thoughtfully.